A genepop file containing ddRAD genotypes for 252 gray seals from the Northwest Atlantic. All including loci were genotyped in at least 80% of the individuals in each sample group. Gray seals samples represent three breeding colonies and up to five cohorts per colony. Locus names are composed of the LocusID that corresponds to the RAD loci catalog FASTA file and the position of the variable nucleotide within the locus
